Coöperating keys.



C. C. CHAMBERLIN.

coo'PERATmG KEYS.

APPLICATION FILED OCT-2, 19l3.

1,137,256. Patented Apr. 27, 1915.

V V Attorneys Witnesses THE NORRIS PETcRS 60.. PHOTULITHON WASHINGTON.by C.'

CHARLES C. CHAMBERLIN, OF WASHINGTON, PENNSYLVANIA.

ooorERATINe KEYS.

Application filed October 2, 1913.

To all whom it may concern:

= Be it known that I, CHARLES C. CHAMBER- LIN, a citizen of the UnitedStates, residing at Washington, in the county of VVashington and Stateof Pennsylvania, have invented new and useful Cooperating Keys, of whichthe following is a. specification.

The present invention appertains generally to keys for locking pulleywheels, fly wheels, cranks and the like, upon shafts, and aims toprovide a novel and improved device of that character.

It is the object of the present invention to provide a locking device ofthe nature indicated embodying a primary or looking key and a secondaryor relief key, the former being employed for looking a pulley wheel orthe like upon the shaft, and the latter being adapted to liberate theprimary or looking key when desired.

With the foregoing general objects outlined, and with other objects inview,which will be apparent as the nature of the invention is betterunderstood, the present invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, can be made within thescope of what is claimed, without departing from the spirit of theinvention.

The invention has been illustrated in one of its preferred embodimentsin the accompanying drawing, wherein Figure 1 is a fragmental view of ashaft and pulley wheel mounted thereon illustrating the improved lockingmeans applied thereto. Fig. 2 is a sectional detail taken on the line 22of Fig. 1.

In the drawing, the numeral 1 designates an ordinary shaft, upon whichis mounted a pulley wheel embodying the side plates 2 and 2' betweenwhich are disposed wood or fiber boards 3, bolts 4 being passed throughthe side plates 2 and 2, and the members 3, to clamp the members 3between the side plates. It is to be understood, however, that thepresent invention may be employed for locking various parts upon shafts,such as pulley wheels, fly wheels, cranks and the like. The particularapplication of the invention to the pulley wheel illustrated anddescribed hereinafter is therefore to be taken as typical. In carryingout the Specification of Letters Patent.

Patented Apr. 27, 1915.

Serial No. 793,045.

present invention, the shaft 1 is provided with the longitudinal keyseat or groove 5, and the side plate 2 is keyed upon the shaft 1 in thewell known manner. Thus, the side plate 2 is provided with a notch orkeyway 6 into which a tapered key 7 is driven along the key seat 5, thekey 7 having a driving lug 8 at its outer end.

Coming to the present improvements, which reside in the manner oflocking the side plate 2 to the shaft 1, there are em ployed thefollowing essentials: The side plate 2 is provided with a notch orkeyway 9, the remote walls of the key seat 5 and keyway 9 beingsubstantially parallel. The primary or looking key 10 is slidablydisposed within the key seat 5, while the secondary or relief key 11 isseated within the keyway 9, the two keys having cooperating inclinedfaces. In other words, the primary key 10 is tapered inwardly, while thekey 11 is tapered outwardly, the two keys therefore being reverselytapered.

The remote faces of the keys 10 and 11 are parallel so as to properlyengage the remote walls of the key seat and keyway, and the adjacentfaces of the keys extend diagonally from the outer ends of the keystoward the axis of the shaft. The key 10 not only fits within the seat 5but extends partially into the keyway 9, while the key 11 is confinedentirely within the outline of the keyway 9 and is spaced throughout itslength from the key seat. The respective keys l0 and 11 are provided attheir outer ends with the angular driving lugs 12 and 13, the primaryand secondary keys being relatively long and short, it being preferableto have their inner ends flush, when the locking or primary key isdriven home. The outer end of the main or locking key 10 projects beyondthe secondary or relief key.

The members 3, or that member 3 adjoining the side plate 2, may be cutaway, as at 1 1, to permit of the passage of the keys 10 and 11 slightlybeyond the plate 2.

If desired, the hub or boss 15 of the side plate 2 may be reinforced bya band 16 to prevent the hub of the plate 2 from being ruptured orfractured by the expansive effort of the keys.

In keying the pulley wheel upon the shaft, it will be apparent thetapered key 7 may be readily driven home, to lock the side plate 2' uponthe shaft. The relief key 11 is then inserted into the keyway 9 of theside plate 2 and the looking or primary key 10 is then slid along thekey seat 5 underneath the relief key 11. After the key 11 has beenproperly positioned, the key 10 is driven forcibly inwardly so as tojamb the relief key lloutwardly against the keyway 9 and to cause thekey 10 to bind between the relief key and the key seat 5 Within themouth of the keyway 9. In this manner, the pulley will be securely keyedupon the shaft.

lVhen it is desired to release the pulley, it is merely necessary todrive the relief key 11 inwardly, this being readily accomplished bystriking the lug 13 with a hammer or other suitable implement. Therelief key being driven inwardly will thereby loosen the looking key 10and as a result, the looking key may be withdrawn, as well as the relief key. The side plate 2 will then be loosened from the shaft, and itis an easy matter to force the pulley off of the key 7.

With the primary and secondary keys 10 and 11 the member 2 may bereadily locked upon the shaft, and may be readily loosened or released,without difiiculty, or Without injuring or breaking any of the parts.

Particular attention is directed to the fact that the outwardly-taperedkey 11 is disengaged from the key seat 5, and that the largest end ofthe key 10 and the smallest end of the key 11 are exposed and providedwith the driving portions 12 and 13, respectively, in order that thedesired results may Copies of this patent may be obtained .for fivecents each, by addressing the be attained in a satisfactory andpractical manner.

Although the present invention is especially adapted for use in gas oroil well machinery, for locking wheels of the character illustrated uponshafts, it is to be understood that the present invention may beotherwise employed, as will beobvious to the artisan.

Having thus described the invention, What is claimed as new is Incombination, a shaft having a key 'se at, a member thereon having acomplementary keyway, a tapered relief key disposed Within the keywayand disposedwholly outside of the key seat, and a tapered main keydisposed within the key seat, entering the keyway and resting againstthe relief key, one end of the main key projecting beyond the relief keyand having an angular-1y extending driving portion, the correspondingend of the relief key having an angularly extending driving portionprojecting beyond the aforesaid driving portion, and the adjacent facesof the two keys extending diagonally from the ends of the keys havingsaid driving portions toward the axis of the shaft.

In testimony that I claim the foregoing as my own, I have hereto aflixedmy signature in the presence of two witnesses.

CHARLES C. CHAMBERLIN.

Witnesses:

HENRY L. ERLEAME, CLARA C. DEGERING.

Commissioner of Patents,

Washington, v1). 9.

